HP 6120XG ProCurve Series 6120 Blade Switches Management and Configuration Gui - Page 514
Effect of Downstream VLAN Tagging on Untagged, Mirrored Traffic, B-26.
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Monitoring and Analyzing Switch Operation Traffic Mirroring Effect of Downstream VLAN Tagging on Untagged, Mirrored Traffic In a mirroring application, if mirrored traffic leaves the switch without 802.1Q VLAN tagging, but is forwarded through a downstream device that adds 802.1Q VLAN tags, then the MTU for untagged, mirrored frames leaving the source switch is reduced below the values shown in table B-2. That is, if the MTU on the path to the destination is 1522 bytes, then untagged, mirrored frames leaving the source switch cannot exceed 1518 bytes. If the MTU on the path to the destination is 9220 bytes, then untagged, mirrored frames leaving the source switch cannot exceed 9216 bytes. Tagged 10 Gbps VLAN link. Adds 4 bytes to each frame. Switch (Aggregator) Untagged 1 Gbps VLAN Links Switch (Mirror Source) Switch (Mirror Source) Router in the Mirror Path 1Gbps Switch (Remote Mirror Destination) Traffic Analyzer Due to VLAN tagging on the 10 Gbps link, untagged traffic from the mirror sources must be at least 4 bytes smaller than the MTU for the path to the mirror destination. Figure B-26. Effect of Downstream VLAN Tagging on the MTU for Mirrored Traffic B-44
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